Offset

The term offset refers to the position or index of an element within an array or a string. Offsets are usually integers.

<?php

    $array = ['a', 'b', 'c'];
    $offset = 1;
    echo $array[$offset];  // b

    $string = 'ABC';
    $offset = 2;
    echo $string[$offset];  // C

?>

Related : Array, String, Index For Arrays